Add a chrome://webapks page.

components/components_strings.grd

 <?xml version="1.0" encoding="utf-8"?>
 
 <grit latest_public_release="0" current_release="1"
       output_all_resource_defines="false" source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/components_strings.h" type="rc_header">
       <emit emit_type='prepend'></emit>
     </output>
     <output filename="components_strings_am.pak" type="data_package" lang="am" />
     <output filename="components_strings_ar.pak" type="data_package" lang="ar" />
@@ skipping 195 matching lines @@
       <part file="physical_web_ui_strings.grdp" />
       <part file="policy_strings.grdp" />
       <part file="security_interstitials_strings.grdp" />
       <part file="security_state_strings.grdp" />
       <part file="ssl_errors_strings.grdp" />
       <part file="supervised_user_error_page_strings.grdp" />
       <part file="sync_ui_strings.grdp" />
       <part file="translate_strings.grdp" />
       <part file="undo_strings.grdp" />
       <part file="version_ui_strings.grdp" />
+      <part file="webapks_ui_strings.grdp" />
       <part file="web_contents_delegate_android_strings.grdp" />
 
       <!-- Generic terms -->
       <message name="IDS_CANCEL" desc="Used for Cancel on buttons">
         Cancel
       </message>
       <message name="IDS_CLOSE" desc="A generic term for Close on buttons and menus.">
         Close
       </message>
       <message name="IDS_DONE" desc="A generic term for Done on buttons and menus.">
@@ skipping 72 matching lines @@
         Your connection to this site is not private.
       </message>
 
       <!-- Advanced Section Titles -->
       <message name="IDS_OPTIONS_ADVANCED_SECTION_TITLE_PRIVACY">
         Privacy
       </message>
     </messages>
   </release>
 </grit>